US Bridges

TR 37A over Rock Springs Branch

Good

St. Clair County, Illinois · .5 M East Ch 61 · Structure no. 082308000000000

Built
1989
36 years old
Condition
Good
inspected March 2022
Type
Culvert
Concrete
Length
43 ft
3 main spans
Daily traffic
575
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

TR 37A over Rock Springs Branch is a concrete culvert carrying TR 37A over Rock Springs Branch in St. Clair County, Illinois. It was built in 1989, so it is 36 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 575 vehicles a day, roughly 10% of them trucks, projected to reach 758 by 2046. The structure is 43 ft (13.1 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesTR 37A
CrossesRock Springs Branch
Location.5 M East Ch 61
RouteCity Street 0
CountySt. Clair County
StateIllinois
Coordinates38.59173, -89.86659
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span14 ft (4.3 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic575 (2023)
Projected traffic758 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was TR 37A over Rock Springs Branch built?

It was built in 1989, making it 36 years old in 2025.

What condition is TR 37A over Rock Springs Branch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2022.

How much traffic does TR 37A over Rock Springs Branch carry?

About 575 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is TR 37A over Rock Springs Branch?

The structure is 43 ft (13.1 m) long with a longest span of 14 ft (4.3 m) and a deck 28 ft wide.

Who owns TR 37A over Rock Springs Branch?

It is owned by the City or Municipal Highway Agency.